Battery cell comprising protection circuit module assembly having lead plate

ABSTRACT

Provided is a plate-shaped battery cell in which electrode leads are located at one side end portion of a battery case including an excess sealing portion of a thermally-welded or adhesive structure for sealing an electrode assembly. the battery cell includes: a Protection Circuit Module (PCM) assembly having one or more safety elements for preventing overcurrent, wherein the PCM assembly includes a PCM and a conductive lead plate for electrically connecting the electrode leads, wherein the lead plate includes: an electrode lead connection portion positioned at one side end portion of the lead plate for electrically connecting the PCM and the electrode lead; a PCM connection portion located at the other side end portion of the lead plate for connecting to a connection portion of a printed circuit board on which a protection circuit is formed; and a bent portion extending from the electrode lead connection portion to be bent to face the outer surface of the battery case in order to prevent damage to the battery case occurring during a process of connecting the electrode lead to the electrode lead connecting portion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of co-pending U.S. application Ser.No. 15/812,343 filed on Nov. 14, 2017, which claims priority to KoreanPatent Application No. 10-2016-0144996 filed on Nov. 2, 2016 and all thebenefits accruing therefrom under 35 U.S.C. § 119, the contents of whichare incorporated by reference in their entirety.

BACKGROUND

The present disclosure relates to a battery cell including a protectioncircuit module assembly having a lead plate.

In recent years, as the price of energy sources is increased due todepletion of fossil fuels and the interest in environmental pollution isamplified, the demand for environmentally friendly alternative energysources becomes an indispensable factor for the future. Variousresearches on power generation technologies such as nuclear power, solarpower, wind power, and tidal power are continuing, and electric powerstorage devices for more efficient use of such generated energy are alsoattracting much attention.

Especially, as technology development and demand for mobile devicesincrease, the demand for a battery as an energy source is rapidlyincreasing, and in recent years, the use of secondary batteries as apower source for electric vehicles (EV) and hybrid electric vehicles(HEV) has been realized and the use area has also been expanded for useas a power auxiliary power source through a grid. Therefore, manyresearches are conducted on the battery that can meet various demands.

Typically, there is a high demand for a prismatic secondary battery anda pouch-shaped secondary battery which can be applied to products suchas mobile phones with a thin thickness in terms of the shape of thebattery and there is a high demand for lithium secondary batteries, suchas lithium ion batteries and lithium ion polymer batteries, which haveadvantages such as high energy density, discharge voltage, and outputstability in terms of materials.

In particular, since aluminum laminate sheets are used as exteriormembers, pouch-shaped batteries are attracting much attention due totheir advantages such as small weight, low manufacturing cost, and easyshape deformation.

FIG. 1 is an exploded perspective view schematically illustrating atypical structure of a typical conventional pouch-shaped secondarybattery.

Referring to FIG. 1, a pouch-shaped secondary battery 10 includes astack-type electrode assembly 20 having a plurality of electrode tabs 21and 22 protruding therefrom, two electrode leads 30 and 31 connected tothe electrode tabs 21 and 22, respectively, and a battery case 40 havinga structure for receiving and sealing the stack-type electrode assembly20 to expose a part of the electrode leads 30 and 31 to the outside.

The battery case 40 includes a lower case 42 including a concave shapedreception portion 41 into which the stack-type electrode assembly 20 canbe seated, and an upper case 43 for sealing the upper case 20 as a coverof the lower case 42. The upper case 43 and the lower case 42 arethermally welded together with the stack-type electrode assembly 20built therein to form a sealing portion (not shown) along the outercircumferential surface of the battery case.

Moreover, FIG. 2 shows photographs in which electrode leads of a batterycell according to the related art are bent and connected to a leadplate.

As shown in FIG. 2, in the prior art, the lead plate is used toelectrically connect the protection circuit module and the electrodelead of the battery cell. To efficiently optimize the internal space ofthe battery pack, after the electrode lead is connected to the leadplate, a process of bending the electrode lead over the sealing portionof the battery case was performed.

In addition, FIG. 3 illustrates photographs showing damages of a batterycell generated during a process of connecting an electrode lead of abattery cell to a lead plate according to a related art.

As shown in FIGS. 2 and 3, in the process of bending the electrode lead,it is easy for the operator to damage the sealing part of the batterycase or the receiving part for receiving the electrode assembly, so thata short circuit may be caused by the damaged part, causing ignition, orelectrolyte leakage through the damaged battery case, and problems suchas an anode connection may be caused.

Specifically, in the process of bending the electrode lead, since thebending force varies depending on the operator, it has been difficult toachieve uniformity of the manufacturing quality by hand.

In addition, the damaged portion of the battery case due to the bendingoperation of the electrode lead is not easily visible, and after theconnection, defect is not found and missed during the quality inspectionof inspectors on the manufacturing line.

Further, when an insulation tape is attached to an area where damage isexpected in order to prevent damage from occurring in the process ofbending the electrode lead, the cost of workers and auxiliary materialsmay be increased.

Therefore, there is a high need to develop a technique that effectivelyprevents damage to a battery case, which occurs during the process ofbending an electrode lead, without significantly increasing themanufacturing cost.

SUMMARY

The present disclosure confirms that the damage of a battery case can beeffectively prevented while minimizing the manufacturing cost withoutany additional member when a bent portion is formed extending from anelectrode lead connection portion so as to be bent to face the outersurface of the battery case in order to prevent damage to the batterycase that may occur during the process of connecting the lead electrodeto the electrode lead connection portion of the lead plate.

In accordance with an exemplary embodiment, provided is a plate-shapedbattery cell in which electrode leads are located at one side endportion of a battery case including an excess sealing portion of athermally-welded or adhesive structure for sealing an electrodeassembly. the battery cell includes: a Protection Circuit Module (PCM)assembly having one or more safety elements for preventing overcurrent,wherein the PCM assembly includes a PCM and a conductive lead plate forelectrically connecting the electrode leads, wherein the lead plateincludes: an electrode lead connection portion positioned at one sideend portion of the lead plate for electrically connecting the PCM andthe electrode lead; a PCM connection portion located at the other sideend portion of the lead plate for connecting to a connection portion ofa printed circuit board on which a protection circuit is formed; and abent portion extending from the electrode lead connection portion to bebent to face the outer surface of the battery case in order to preventdamage to the battery case occurring during a process of connecting theelectrode lead to the electrode lead connecting portion.

Accordingly, in order to prevent damage to the battery case that mayoccur during the process of connecting the lead electrode to theelectrode lead connection portion of the lead plate of the presentinvention, the battery cell according to the present invention includesa bent portion extending from the electrode lead connection portion to astructure bent to face the outer surface of the battery case, so that itis possible to effectively prevent damage to the battery case whileminimizing the manufacturing cost without any additional member.

In a specific embodiment, the plate-shaped battery cell has a structurein which the electrode assembly is sealed in a pouch-shaped battery caseof a laminate sheet including a resin layer and a metal layer.

Specifically, the pouch-shaped battery case includes a laminate sheetincluding an outer resin layer made of a polymer resin having weatherresistance, a metal layer having barrier properties against gas andliquid, and an inner resin layer made of a polymer resin having heatmelting property, and in relation to a thickness to width on the whole,an insulating tape may be a plate-like type at an interface portionbetween the lead plate and the battery case in the battery cell.

In addition, the excess sealing portion may be a sealing portion formedby thermal melting of the battery case.

In a specific embodiment, the lead plate may include a main body portionformed of a strip-shaped flat plate. In addition, the electrode leadconnection portion may extend from the main body portion of the leadplate and have an L shape on a plane.

Moreover, the main body portion of the lead plate may be formed with aninclined portion to form a height difference with respect to the ground.By forming the inclined portion in the lead plate in such a way, theinternal space of the battery pack may be effectively utilized.

Specifically, the bent portion extends from the electrode leadconnection portion in the direction in which a reception portionreceiving an electrode assembly of the battery case is located, and dueto such a structure, it is possible to prevent the electrode lead fromcontacting the reception portion of the battery case while being bent.

Also, for this, the bent portion may be bent in a shape corresponding toone side wall portion of the reception portion of the battery case.

In a specific embodiment, the electrode lead may be bent at least onceso as to be connected to face the electrode lead connection portion ofthe lead plate. When the lead plate is positioned above the excesssealing portion of the battery case, the electrode lead positioned atthe lower end thereof is bent at least once to face the electrode leadconnection portion of the lead plate.

In a specific embodiment, in order to prevent damage to the battery celldue to a short or contact between the internal components of the batterypack, an insulating film may be coated on the lead plate except for theelectrode lead connection portion, the PCM connection portion, and thebent portion.

In a specific embodiment, the insulating film may be made of a polyimideresin and is not necessarily limited to such a material, and may beapplied to a lightweight electrically insulating polymer resin film. Forexample, in another embodiment, the insulating film may be made of oneor more materials selected from the group consisting of polyethyleneterephthalate and polypropylene.

In a specific embodiment, the end edges of the bent portion may beformed with a rounding structure. This rounding structure has anadvantage that it can effectively prevent the damage of the battery casethat may occur when the end edges of the bent portion contact thebattery case.

In a specific embodiment, in order to reliably block the contact betweenthe electrode lead and the battery case, the width of the bent portionmay be formed to be larger than the width of the electrode lead withrespect to the direction extending from the electrode lead connectionportion. Specifically, the width of the bent portion may be 2 mm or morelarger than the width of the electrode lead.

In a specific embodiment, the plate thickness of the bent portion may beformed to be relatively thinner than the thickness of the electrodelead. When the plate thickness of the bent portion is designed to berelatively thinner than the thickness of the electrode lead, the spotwelding of the electrode lead connection portion and the electrode leadis excellent, and the bending operation is facilitated.

In a specific embodiment, the bent portion may be coated with aninsulating film. With this configuration, an effect of preventing damagedue to contact between the bent portion and the reception portion of thebattery case may be obtained.

In a specific embodiment, in order to ensure reliable insulation betweenthe lead plate and the electrode lead with the battery case, aninsulating tape may be interposed at the interface portion between thelead plate and the battery case.

In a specific embodiment, the electrode assembly may include an anode, acathode, and a separator structure interposed between the anode and thecathode.

The anode may be prepared, for example, by applying a mixture of ananode active material, a conductive material, and a binder on an anodecurrent collector, followed by drying. If necessary, a filler may befurther added to the mixture.

The anode active material is a material capable of causing anelectrochemical reaction and includes two or more transition metals as alithium transition metal oxide, for example, a layered compound such aslithium cobalt oxide (LiCoO₂) or lithium nickel oxide (LiNiO₂)substituted with one or more transition metals, lithium manganese oxidesubstituted with one or more transition metals, a lithium nickelrepresented by the formula LiNi_(1−y)M_(y)O₂ (where M=Co, Mn, Al, Cu,Fe, Mg, B, Cr, Zn, or Ga and including at least one element of the aboveelements, 0.01≤y≤0.7), lithium nickel cobalt manganese composite oxiderepresented by Li_(1+z)Ni_(b)Mn_(c)Co_(1−(b+c+d))MdO_((2−e))Ae (where−0.5≤z≤0.5, 0.1≤b≤0.8, 0.5≤c≤0.8, 0≤d≤0.2, 0≤e≤0.2, b+c+d<1, M=Al, Mg,Cr, Ti, Si, or Y, A=F, P, or Cl) such asLi_(1+z)Ni_(1/3)Co_(1/3)Mn_(1/3)O₂, Li_(1+z)Ni_(0.4)Mn_(0.4)CO_(0.2)O₂,and the like, and olivine-based lithium metal phosphate represented bythe formula Li_(1+z)M_(1−y)M′_(y)PO_(4−z)X_(z)(where M=transition metal,preferably, Fe, Mn, Co, or Ni, M′=Al, Mg, or Ti, X=F, S, or N, but isnot limited thereto.

The conductive material is usually added in an amount of 1 to 20 wt %based on the total weight of the mixture including the anode activematerial. Such a conductive material is not particularly limited as longas it has electrical conductivity without causing a chemical change inthe battery, and for example, graphite such as natural graphite orartificial graphite, carbon black such as carbon black, acetylene black,Ketjen black, channel black, furnace black, lamp black, and summerblack, conductive fibers such as carbon fiber and metal fiber, metalpowders such as carbon fluoride, aluminum and nickel powder, conductivewhiskey such as zinc oxide and potassium titanate, conductive metaloxides such as titanium oxide, and conductive materials such aspolyphenylene derivatives may be used.

The filler is optionally used as a component for suppressing theexpansion of the anode, and a fibrous material is not particularlylimited as long as it does not cause chemical change in the battery, andfor example, olefin polymers such as polyethylene and polypropylene andfibrous materials such as glass fibers and carbon fibers are used.

In addition, the cathode may be manufactured by, for example, applying amixture of a cathode active material, a conductive material, and abinder onto a cathode current collector and drying it, and if necessary,a filler may be further added to the mixture. Furthermore, the cathodeactive material may be at least one selected from the group consistingof graphite carbon, coke carbon, and hard carbon.

The present invention also provides a battery pack characterized byincluding at least one battery cell.

Since the configurations of the battery cells described above are wellknown to those skilled in the art, a detailed description thereof willbe omitted herein.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments can be understood in more detail from thefollowing description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is an exploded perspective view showing a general structure of atypical conventional pouch-shaped secondary battery;

FIG. 2 shows photographs in which electrode leads of a battery cellaccording to the related art are bent and connected to a lead plate;

FIG. 3 illustrates photographs showing damages of a battery cellgenerated during a process of connecting an electrode lead of a batterycell to a lead plate according to a related art;

FIG. 4 is a perspective view schematically showing a battery cell wherea lead plate is connected according to an embodiment of the presentinvention;

FIG. 5 is a perspective view schematically showing a battery cellincluding a protection circuit module assembly according to anembodiment of the present invention;

FIG. 6 is a perspective view schematically showing an enlarged portionof a battery cell according to an embodiment of the present invention;

FIG. 7 is a perspective view schematically showing an enlarged portionof a battery cell according to another embodiment of the presentinvention;

FIG. 8 is a perspective view schematically showing an enlarged portionof a battery cell according to another embodiment of the presentinvention; and

FIG. 9 is a perspective view schematically showing a battery packaccording to another embodiment of the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

Hereinafter, the contents of the present invention will be described indetail with reference to the drawings, but the scope of the presentinvention is not limited thereto.

FIG. 4 is a schematic perspective view showing a battery cell to which alead plate is connected according to an embodiment of the presentinvention, and FIG. 5 is a schematic perspective view showing a batterycell including a protection circuit module assembly according to oneembodiment of the present invention.

Referring to FIGS. 4 and 5, a battery cell 100 according to the presentinvention is a plate-shaped battery cell 100 in which electrode leads115 and 116 are located at one side end portion of a battery case 110including an excess sealing portion 114 of a thermally-welded oradhesive structure for sealing an electrode assembly (not shown).

The battery cell 100 includes a Protection Circuit Module (PCM) assembly200 having one or more safety elements (not shown) for preventingovercurrent. The PCM assembly 200 includes a PCM 210 and a conductivelead plate 120 for electrically connecting the electrode leads 115 and116 to each other.

At this time, the lead plate 120 includes an electrode lead connectionportion 124 positioned at one side end portion of the lead plate 120 forelectrically connecting the PCM 210 and the electrode lead 115, a PCMconnection portion 125 located at the other side end portion of the leadplate 120 for connecting to a connection portion 220 of the printedcircuit board on which a protection circuit is formed, and a bentportion 126 extending from the electrode lead connection portion 124 tobe bent to face the outer surface of the battery case 110 in order toprevent damage to the battery case 110 occurring during the process ofconnecting the electrode lead 115 to the electrode lead connectingportion 124.

In addition, the plate-shaped battery cell 100 has a structure in whichan electrode assembly (not shown) is sealed in the pouch-shaped batterycase 110 of a laminate sheet.

FIG. 6 is a perspective view schematically showing an enlarged portionof a battery cell according to an embodiment of the present invention.

Referring to FIG. 6, the lead plate 120 includes a main body portion 122formed of a strip-shaped flat plate. In addition, the electrode leadconnection portion 124 extends from the main body portion 122 of thelead plate 120 and has an L shape on a plane.

Moreover, the main body portion 122 of the lead plate 120 is formed withan inclined portion 123 to form a height difference with respect to theground. By forming the inclined portion 123 in the lead plate 120 insuch a way, the internal space of the battery pack may be effectivelyutilized.

Furthermore, the bent portion 126 extends from the electrode leadconnection portion 124 in the direction in which a reception portion 112receiving an electrode assembly (not shown) of the battery case 110 islocated, and due to such a structure, it is possible to prevent theelectrode lead 115 from contacting the reception portion 112 of thebattery case 110 while being bent.

Also, for this, the bent portion 126 is bent in a shape corresponding toone side wall portion of the reception portion 112 of the battery case110.

At this time, the electrode lead 115 is bent at least once so as to beconnected to face the electrode lead connection portion 124 of the leadplate 120. Moreover, when the lead plate 120 is positioned above theexcess sealing portion of the battery case 110, the electrode lead 115positioned at the lower end thereof is bent at least once to face theelectrode lead connection portion 124 of the lead plate 120.

Again, referring to FIG. 6 together with FIG. 4, in order to preventdamage to the battery cell 100 due to a short or contact between theinternal components of the battery pack (not shown), an insulating film141 is coated on the lead plate 120 except for the electrode leadconnection portion 124, the PCM connection portion 125, and the bentportion 126. At this time, the insulating film 141 is made of polyimideresin.

FIG. 7 is a perspective view schematically showing an enlarged portionof a battery cell according to another embodiment of the presentinvention.

Referring to FIG. 7, in a battery cell 101 according to anotherembodiment of the present invention, the end edges 131 and 132 of a bentportion 126 of a lead plate 120 are formed in a rounding structure. Thisrounding structure has an advantage that it can effectively prevent thedamage of the battery case 110 that may occur when the end edges 131 and132 of the bent portion 126 contact the battery case 110.

Furthermore, in order to reliably block the contact between theelectrode lead 115 and the battery case 110, the width W1 of the bentportion 126 is formed to be larger than the width W2 of the electrodelead 115 with respect to the direction extending from the electrode leadconnection portion 124. Specifically, the width W1 of the bent portion126 is 2 mm or more larger than the width W2 of the electrode lead 115.

In addition, the thickness of the bent portion 126 is formed to berelatively thinner than the thickness of the electrode lead 115.

Furthermore, in order to ensure reliable insulation between the leadplate 120 and the electrode leads 115 with respect to the battery case110, an insulating tape 150 is interposed between the lead plate 120 andthe battery case 110.

FIG. 8 is a perspective view schematically showing an enlarged portionof a battery cell according to another embodiment of the presentinvention.

Referring to FIG. 8, an insulating film 141 is coated on a bent portion126 of a lead plate 120 of a battery cell 102 according to anotherembodiment of the present invention. In other words, both the main bodyportion 122 and the bent portion 126 of the lead plate 120 are coveredwith the insulating film 141. With this structural feature, it ispossible to effectively prevent the bent portion 126 from being damageddue to contact with the battery case 110.

FIG. 9 is a perspective view schematically showing a battery packaccording to another embodiment of the present invention.

Referring to FIGS. 5 and 9 together, the present invention alsodiscloses a battery pack 500 including at least one battery cell 100.

As described above, in order to prevent damage to the battery case thatmay occur during the process of connecting the lead electrode to theelectrode lead connection portion of the lead plate of the presentinvention, the battery cell according to the present invention includesa bent portion extending from the electrode lead connection portion to astructure bent to face the outer surface of the battery case, so that itis possible to effectively prevent damage to the battery case whileminimizing the manufacturing cost without any additional member.

Although the battery cell including a protection circuit module assemblyhaving a lead plate has been described with reference to the specificembodiments, it is not limited thereto. Therefore, it will be readilyunderstood by those skilled in the art that various modifications andchanges can be made thereto without departing from the spirit and scopeof the present invention defined by the appended claims.

What is claimed is:
 1. A plate-shaped battery cell in which an electrodelead is located at one side end portion of a battery case including anexcess sealing portion for sealing an electrode assembly, the batterycell comprising: a Protection Circuit Module (PCM) assembly having oneor more safety elements for preventing overcurrent, wherein the PCMassembly comprises a Protection Circuit Module (PCM) and a conductivelead plate for electrically connecting the electrode lead, wherein theconductive lead plate comprises: an electrode lead connection portionpositioned at one side end portion of the conductive lead plate forelectrically connecting the PCM and the electrode lead; a PCM connectionportion located at the other side end portion of the conductive leadplate for connecting to a connection portion of a printed circuit boardon which a protection circuit is formed; and a bent portion extendingfrom the electrode lead connection portion and bent to face the outersurface of the battery case to prevent damage to the battery caseoccurring during a process of connecting the electrode lead to theelectrode lead connecting portion, wherein the electrode lead connectionportion, the PCM connection portion, and the bent portion of theconductive lead plate are all conductive, and wherein the width of thebent portion is larger than the width of the electrode lead with respectto a direction extending from the electrode lead connection portion. 2.The battery cell of claim 1, wherein the flat thickness of the bentportion is at least the same as the thickness of the electrode lead. 3.The battery cell of claim 1, wherein the bent portion extends from theelectrode lead connection portion in a direction in which a receptionportion receiving the electrode assembly of the battery case is located,wherein the reception portion is disposed angled to the excess sealingportion.
 4. The battery cell of claim 3, wherein the reception portionis disposed perpendicular to the excess sealing portion.
 5. The batterycell of claim 3, wherein the bent portion is interposed between an endof the electrode lead and the reception portion.
 6. The battery cell ofclaim 1, wherein the plate-shaped battery cell has a structure in whichthe electrode assembly is sealed in a pouch-shaped battery case of alaminate sheet including a resin layer and a metal layer.
 7. The batterycell of claim 1, wherein the excess sealing portion is a sealing portionformed by a heat welding of the battery case.
 8. The battery cell ofclaim 1, wherein the conductive lead plate comprises a main body portionformed of a strip-shaped flat plate.
 9. The battery cell of claim 8,wherein the electrode lead connection portion extends from the main bodyportion of the conductive lead plate and has an L shape on a plane. 10.The battery cell of claim 8, wherein the main body portion of theconductive lead plate is formed with an inclined portion to form aheight difference with respect to the ground.
 11. The battery cell ofclaim 1, wherein the bent portion is bent in a shape corresponding toone side wall portion of a reception portion of the battery case. 12.The battery cell of claim 1, wherein the electrode lead is bent at leastonce so as to be connected to face the electrode lead connection portionof the conductive lead plate.
 13. The battery cell of claim 1, whereinan insulating film is coated on the remaining portion of the conductivelead plate except for the electrode lead connection portion, the PCMconnection portion, and the bent portion.
 14. The battery cell of claim13, wherein the insulating film is made of polyimide resin.
 15. Thebattery cell of claim 1, wherein the end edges of the bent portion areformed in a rounding structure.
 16. The battery cell of claim 1, whereinan insulating film is coated on the bent portion.
 17. The battery cellof claim 1, wherein an insulating tape is interposed at an interfaceportion between the conductive lead plate and the battery case.
 18. Abattery pack comprising at least one battery cell according to claim 1.19. A plate-shaped battery cell in which an electrode lead is located atone side end portion of a battery case including an excess sealingportion for sealing an electrode assembly, the battery cell comprising:a Protection Circuit Module (PCM) assembly having one or more safetyelements for preventing overcurrent, wherein the PCM assembly comprisesa Protection Circuit Module (PCM) and a conductive lead plate forelectrically connecting the electrode lead, wherein the conductive leadplate comprises: an electrode lead connection portion positioned at oneside end portion of the conductive lead plate for electricallyconnecting the PCM and the electrode lead; a PCM connection portionlocated at the other side end portion of the conductive lead plate forconnecting to a connection portion of a printed circuit board on which aprotection circuit is formed; and a bent portion extending from theelectrode lead connection portion and bent to face the outer surface ofthe battery case to prevent damage to the battery case occurring duringa process of connecting the electrode lead to the electrode leadconnecting portion, wherein the electrode lead connection portion, thePCM connection portion, and the bent portion of the conductive leadplate are all conductive, wherein the bent portion extends from theelectrode lead connection portion in a direction in which a receptionportion receiving the electrode assembly of the battery case is located,and wherein the reception portion is disposed angled to the excesssealing portion.
 20. A plate-shaped battery cell in which an electrodelead is located at one side end portion of a battery case including anexcess sealing portion for sealing an electrode assembly, the batterycell comprising: a Protection Circuit Module (PCM) assembly having oneor more safety elements for preventing overcurrent, wherein the PCMassembly comprises a Protection Circuit Module (PCM) and a conductivelead plate for electrically connecting the electrode lead, wherein theconductive lead plate comprises: an electrode lead connection portionpositioned at one side end portion of the conductive lead plate forelectrically connecting the PCM and the electrode lead; a PCM connectionportion located at the other side end portion of the conductive leadplate for connecting to a connection portion of a printed circuit boardon which a protection circuit is formed; and a bent portion extendingfrom the electrode lead connection portion and bent to face the outersurface of the battery case to prevent damage to the battery caseoccurring during a process of connecting the electrode lead to theelectrode lead connecting portion, wherein the electrode lead connectionportion, the PCM connection portion, and the bent portion of theconductive lead plate are all conductive, and wherein the bent portionis interposed between an end of the electrode lead and a receptionportion receiving the electrode assembly of the battery case.